class GameStats():
  # 跟踪游戏的统计信息
  def __init__(self, ai_settings):
    # 初始化统计信息
    self.ai_settings = ai_settings
    self.reset_stats()

    # 游戏刚启动时则处于活动状态
    self.game_active = False

    # High score should never be reset.
    self.high_score = 0

  def reset_stats(self):
    # 初始化在游戏运行期间可能变化的统计信息
    self.ships_left = self.ai_settings.ship_limit
    self.score = 0
    self.level = 1
